Add deleted in r732 (don't know why) functionality that displays custom Error page when linkname in Developer User Profile url doesn't exist (/site/user/profile/<not_existing_linkname>).
Add deleted in r732 (don't know why) functionality that displays custom Error page when linkname in Developer User Profile url doesn't exist (/site/user/profile/<not_existing_linkname>).

Patch by: Pawel Solyga
Review by: to-be-reviewed

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extra : convert_revision : svn%3A32761e7d-7263-4528-b7be-7235b26367ec/trunk%40779

rhyolight/nupic.son,rhyolight/nupic.son,rhyolight/nupic.son